Valve seat grinder



Aug. 25, 1931. I J. E. WHITMILL VALVE SEAT GRINDER Filed May 29. 1950 Jay/4 IN VEN TOR. dklmszwz'fma'ZZ ATTORNEY V 25 tion.

Patented Aug. 25, 1931 UNITED STATES JAMES E. WI-IITMILL, or HAYNESVILLE, LOUISIANA VALVE SEAT GRINDER Application filed May 29, 1930. Serial No. 457,278.

The object of the invention is to provide a device particularly adapted for refacing the valve seats of engines, particularly such as those employed in 'oil fields, so that it will not benecessary remove the seatfor facing by machinery, as is customarily the case; to provide a grinder which may be actuated by a hand tool, such as the conventional brace, and .which will effectively maintain its position of perpendicularity with reference to the plane of the seat; and to provide a device of this character which is of simple form and therefore susceptible ofcheap manufacture and low marketing cost.

With this object in view, the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawings, wherein: g V

Fi ure 1 is a vertical sectional view throdgh the valve chamber of an engine, position I showing the invention in operative therein. V

Figure 2 1s a top plan view of the inven- Figure 3 is a diametrical sectional view 011 the plane indicated by the line3-3 of Figure 2.

The invention comprises the grinding head go 10 of disk form and constructed preferably of cast iron, although it may be made of any acceptable material. Formed integrally with I the grinding head at the center of the lat ter, is the shank portion 11 at the upper end as ofwhich is disposed the star shaped member I 12 of which the arms 14 are uniformly spaced angularly and have a slightly greater radial extent than the grinding head. The tang 15 extends axially from the upper side of the star shaped'mem'ber and constitutes the means by which the device may be actuated, as-by the conventional'hand brace,

or similar tool. I v

Against. the under face of the grinding head 10 is disposed the grinding disk 16 which may be of carborundum, emeryv or other suitable abrasive. To preclude, relative angular or turning movement between the grinding disk and the head, the former is secured to the latter by fasteners 17, which movement.

, ture.

are preferably bolts extending through the disk and head and disposed on diametrically opposite sides of the shank 11. The grind ing disk 16 has a central clearance opening forthe pilot 18 which extends from the lower face of the grindinghead at the center of the latter through the grinding disk.

The grinding disk on its lower peripheral edge is bevelled, as indicated at 19, in correspondence with the correct bevel of the valve seat to be ground.

When the device is employed to grind a valve seat-,as is disclosed in the drawings, the bevelled grinding edge 19 of the disk 16 is properly disposed on the valve seat by rearounding cylindrical wall of the valve chamber. The actuating tool being engaged with the pilot and star shaped member, the grind- I ing disk will effectively true the seat.

' The star shaped member, it will be noted,

bly three, so that no two may lie in the same diametricalline which would likely prevent consists of an odd number of arms, preferatheir centering function with free turning The invention having been described, what is clanned as new and useful 1s:

A valve seat grinder comprising a grindshank portionby which it is integrally con- 7 nected with the head but axially spaced from the same, the arms of the star-shaped member being of a radial extent to bring them in contact with the wall of the valve chamber, a grinding disk carried on the under face of the head, and a centering pilot protruding from the under faceof the head for sliding engagement with the valve-stem guide.)

In testimony whereof he afiixes his signa- JAMES E; WHITMILL.

the tang 15 the whole device may then be 7 rotated and, being held in proper position by 

